Door-lock.



G. P. HOWARD. noon L00'K. APPLICATION IILED AUG. 12, 1911.

1,099,301. Patented June 9, 191i 2 BHEETB-BHEET 1.,

17309722502: C'karZas'FfiZward C. P. HOWARD.

DOOR LOOK.

APPLICATION FILED AUG.12, 1911.

1,099,30L Patented June 9, 1914.

2 SHEETS-"SHEET 2.

COLUMBIA PLANOGRAPH $0.. WMMINOTON. D.

CHARLES P. HOWARD, OF HARTFORD, CONNECTICUT, ASSIGNOR TO JAMES L. HOWARD & COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATION OF CONNECTICUT.

DOOR-LOCK.

Specification of Letters Patent.

Patented June 9, 1914.

To all whom it may concern.

Be it known that I, CHARLEs P. HowA'no, a citizen of the United :States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented new and useful Improvements in Door-Locks, of which the following is a specification.

This invention is an improved door lock which in the embodiment shown and de scribed herein is especially adapted for locking the combination doors now quite commonly employed for converting the end vestibule of electric motor (cars into a cab for the motorman while operating the car or train, and for shutting in and protecting from the public the control and air-brake appliances of the car when not in use. The general arrangement of such a vestibule and door is shown in Figure 6 of U. S. Patent No. 743,07 9 of November 3, 1903. The door is hinged at the side of the end doorway of the car and is used in the three positions indicated in that figure by the letters B, C and D. When in the position B, the door incloses the controller and air brake appliances L5 and l6 to prevent them from being tampered with by the public; and in the position D the door closes the end doorway of the car. Inboth of these positions it is important to have the door firmly fastened and locked in place. This is particularly true of the position D, to avoid having the door blown open by the strong wind pressure due to the high speed at which these cars are run, and also to exclude the weather. Under such conditions the bolt or catch of an ordinary lock is liable to wear back more or less gradually, until it disengages itself from its keeper or striker, allowing the door to be violently thrown open by the strong wind pressure, to the annoyance and some times to the injury of the passengers, and especially of the motorman, who necessarily stands in its path as it swings violently inward.

A principal object of the invention is to provide a door bolt which can be deadlocked. That is, positively locked both in its locked and unlocked positions, and par ticularly the former, and to provide operating devices for the lock, which shall operate the bolt with irresistible power, so as to force the edge of the door resistlessly to its seat against the Weatherstrip or other devices employed for making a tight joint at the edge'of the door, with a minimum expenditure of power on the part of theopor: ator, and by means of small and compact 1evers, serving also as handles'for the door, whlch by their form, arrangement and posit1on on the lock are protected so that they will be out of the way and not catch the clothing or the person of those who stand or pass close to them.

The embodiment of this invention herein shown is adapted for use upon steel cars having steel doors, although obviously it may be adapted to cars and doors of wood pr other ordinary materials and construc- Fig. 1 of the drawings is a plan view showing the external appearance of one of these locks applied to a steel door and in its locked position. Fig. 2 is a front View projected from Fig. 1, showing the lock in its door-docking position. Fig. 3 is an edge view projected from Fig. 2. Fig. 4 is a rearward side view of the locks of Figs. 1, 2 and 3. Fig. 5 is an edge view projected from Fig. 1, of the striker plate of that figure. Figs. 6, 7 and 8 are side views in enlarged scale, with the front plate of the lock removed, showing the interior mechanism of the lockin three positions. Fig. 6 shows the mechanism in the position inwhich it looks the bolt. Fig. 7 shows the same mechanism in aposition intermediate that of its locked and unlocked position, withthe bolt' drawn part way back; while Fig. .8 shows the bolt wholly'drawn back and fastened. Fig. 9 is an edge view in section taken on the line 9 of Fig. 7. further illustrating the details of the interior parts.

In Fig. 1,. the steel plates '1, commonly employed for the frameworkof steel cars, are shown to be shaped so as toform one side of a doorway to be closed by the door 2. Suitable weatherstrips 3 are fastened to the side of the doorway, to form a weather; tight seat against which the margin of the door abutsu The steel plates 1 are suitably mortised to receive a suitable striker 4, or keeper, for receiving the door boltin the opening 5. The ends of the bolt 6 are preferably beveled or rounded so as to enter easily and form an inclined surface, which during the closing movement of the bolt engages'with the edge or side of the striker plate opening 5 and cooperates therewith to force the door firmly to its seat against the Weatherstrip 3, or other stop provided for seating the door. The edge or side of the opening 5 of the striker plate may be rounded or beveled at 7' instead of or in addition to rounding or beveling the leading corners of the bolt, and for thesame purpose.

The door bolt 6 is fitted to slide in suitable guides in the lock case 10 from the position shown in Fig. 6 to that shown in Fig. 8. Inside the casing the bolt'is enlarged to form ayoke 11 for receiving a cam 12 attached or appurtenant to the lock spindle 13, which is mounted for turning movement in the casing on a center designated by the numeral 14. The ends of the spindle are squared to receive the lever handles 15 and 16, which as shown in Fig. 9 are also journaled in the casing concentrically with the turning movement of the spindle 13 and the cam 12, in'this case being held to place against withdrawal by means of the nuts 17. The lever portions of these knobs or handles which are intended to be grasped by the operator are relatively short, preferably'not extending beyond the edges of the casing; and one or both of them are turned inwardly at its ends as shown by the-handle 15 inv Fig. 3, so as to avoid catching the clothing or the person of the passerby. In this case, in order to Provide room for the operators fingers to pass behind the handle 15, the face of the lock casing 18 is recessed at 19, as shown in Figs.

2' and 9, the space thus provided behind the handle being best shown in Fig. 9, in which the handle 15 is shown in dot-and-dash lines, that not being its correct operating position for that View. The turning of these handles, or either of them, by the operator, serves to revolve the cam 12 from one to the other of the two positions shown in Figs. 6 and 8 through the middle positionshown in Fig. 7 this movement moving the bolt more rapidly at its middle position where it is freest to move and more slowly 1 and therefore powerfully, as the cam approaches what may be termed its dead center positions shown in Figs. 6 and 8. Thus the most powerful action of the cam is exercised when the bolt is entering the striker plate at the conclusion'of its forward movement; Anotherv advantage of these dead center positions of the camis that they serve to dead-lock the bolt in both of its extreme positions, since the pressure of the bolt has no tendency to turn the cam from these positions, and thusallow the bolt to work forwardly from its opened-position, or to work backwardly from its closed position,

As a further security, to prevent accidental or inadvertent turning of the cam by its handles or otherwise, means are provided for yieldingly latching or holding ingly drawn toward each other, as by.

means of a spring 26, stops 27 and 28 being provided for limiting the inward movement of the latches, so as to leave the cam free from the friction ofthe latches when in unlatchedand intermediate positions like that of Fig. 7. These latches hold the cam by means of notches or catches. In the example shown the latches are provided with notches 30 and 31 for receiving a catch 32 appurtenant to the cam. As the cam is turned toward its closed position of Fig. 6,

the catch 32 rides against the latch 22, until it registers with the notch 30 thereof at the dead-locked position. When the cam is turned toward the position shown in Fig. 8,

the catch 32 rides against the latch 23 until it registers with the notch 31 thereof at its other dead-locked position. The engaging surfaces of the catch and the notches are of a suitable inclination for holding the cam against any unintentional operation through the handles 15 or 16, while yielding to a sufficiently strong and intended actuation of those handles. After the catch 32 has been thus forced out of its notch in either latch, the cam 12 revolves freely within the yoke, carrying the bolt, until nearing its other dead-center position, whenthe catch engages with the other latch and snaps into the notch thereof.

The latches 22 and 23 are provided with shoulders just below the notches 30 and 31,

which project under the catch 32 and serve as direct stops for the'extreme rotary positions of the cam, as illustrated in Figs. 6 and 8, thus limiting the turning movements of the cam 12 to half revolutions, forward and back. y

In operation, when the bolt reaches either of its extreme or dead-center positions,-the

handles snap forward a little, as one 'or the.

other of the respective latches close over the catch. It then requires a definite and:

intended force to start the handle in the opposite direction. Thus the bolt is securely held in either of its dead-locked extreme is so utilized and augmented by the cam oreccentric that as the rounded or beveled surfaces of the bolt and the striker engage .with' each other the door'is forced, home toits seat with great power against the pressure of the wind, and whatever spring or other resistance there may be in the weather strip, so that the door is rendered practically air and weather-tight under all conditions liable to be encountered in service.

The term cam as herein employed in the specification and claims is intended to include a crank or eccentric, or any other well-known equivalent device for moving the bolt endwise by the turning movement of the handles. Instead of the catch 32 being appurtenant to the cam, and the notches 30 and 31 being in the latches 22 and 23,

those latches may be provided with projecting catches entering a notch made in a suitable boss of the cam.

I claim as my invention 1. The combination, with a swinging door, of a handle for the door, bolt mechanism, including a cam operated by said handle, and means for holding the cam against rotation, comprising a catch appurtenant to the cam, and a latch for each of the locking positions of the cam.

2. The combination, with a swinging door, of a handle for the door, acam operated by the handle, a catch appurtenant to the cam, a pair of latches disposed on opposite sides of the cam for holding it in two locking positions, and a bolt operated by the cam.

3. The combination, with a swinging door, of a handle for the door, a cam operated by said handle, a bolt operated by the cam, and means for holding the cam against rotation, comprising a catch appurtenant to the cam, a pair of latches disposed on opposite sides of the cam for engaging with the catch to yieldingly hold the cam inits two extreme locking positions, a spring connecting the latches to yieldingly hold them against the catch.

4. The combination, with a swinging door, of a lock therefor, comprising a bolt, a cam for operating the bolt, means for latching the cam in its bolt-closing position, comprising a catch projecting to one side of the plane of the cam, a plurality of latches pivotally mounted 011 opposite sides of the cam for engaging with the catch, and a handle for the door, serving also as a lever for moving the cam.

5. The combination, with a door, of a lock therefor, comprising a bolt, a cam for moving the bolt, means for latching the cam in its dead-center relation to the bolt, comprising a catch disposed at one side of the peripheral face of the cam, a plurality of latches pivotally mounted on opposite sides of the cam, stops for the inward latching positions of the latches, a spring connecting the latches to yieldingly hold them against their respective stops, and a handle for the door serving also as a lever for revolving the cam.

6. The combination, with a door, of a lock therefor, comprising a bolt, a cam for moving the bolt, means for yieldingly latching the cam in its two dead-center positions relative to the bolt, comprising a catch appurtenant to the cam, oppositely disposed latches each provided with a notch for engaging with the catch and with a shoulder forming a stop engaging with the catch to limit the forward and back oscillation of the cam, and a handle for the door serving also as a lever for rotating the cam.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses this 10th day of August, 1911.

CHARLES I. HOWARD.

Witnesses:

VVM. H. I-Iomss. CAROLINE M. BnnoKLn.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

